Method and apparatus for performing csi reporting on basis of subband group

Abstract

The present disclosure relates to a method for reporting channel state information (CSI) in a wireless communication system, which is performed by a terminal, including: receiving information on CSI reporting timing from a base station; receiving, from the base station, first control information, which is information on a frequency region to be subject to subband reporting and second control information, which is information on a maximum number of subbands to be subject to subband reporting; receiving, from the base station, information on a subband starting position for setting a subband group; setting an interval between subbands based on the first control information and the second control information; setting a subband group based on an interval between the starting position and the interval between the subbands; and performing CSI reporting of the set subband group, in which the subband group is a subband to be subject to CSI reporting in the subbands.

1 . A method for reporting channel state information (CSI) in a wireless communication system, the method performed by a terminal, comprising:
 receiving information on CSI reporting timing from a base station;   receiving, from the base station, first control information, which is information on a frequency region to be subject to subband reporting and second control information, which is information on a maximum number of subbands to be subject to subband reporting;   receiving, from the base station, information on a subband starting position for setting a subband group;   setting an interval between subbands based on the first control information and the second control information;   setting a subband group based on an interval between the starting position and the interval between the subbands; and   performing CSI reporting of the set subband group,   wherein the subband group is a subband to be subject to CSI reporting in the subbands.   
     
     
         2 . The method of  claim 1 , further comprising:
 receiving, from the base station, information on a subband size to be used for the CSI reporting through a higher-layer signaling,   wherein the subband group is determined based on the subband size.   
     
     
         3 . The method of  claim 1 , wherein the second control information is determined based on the received CSI-reporting timing. 
     
     
         4 . The method of  claim 1 , wherein the interval is floor (first control information/second control information). 
     
     
         5 . The method of  claim 1 , further comprising:
 transmitting capability information of the terminal;   receiving a reference value of SINR or CQI from a base station; and   measuring the SINR or CQI of a subband,   wherein in the setting of the subband group, the measured SINR or CQI and the reference value are compared with each other to set a subband in which the measured SINR or CQI is equal to or larger than the reference value as a subband group.   
     
     
         6 . The method of  claim 5 , wherein whether to set the subband group is determined based on the capability of the terminal and the received CSI timing. 
     
     
         7 . A terminal for performing a method for setting a subband group to be subject to CSI reporting based on CSI reporting timing in a wireless communication system, the terminal comprising:
 a radio frequency (RF) module transmitting and receiving a radio signal; and   a processor functionally connected with the RF module,   wherein the processor is configured to   receive information on CSI reporting timing from a base station,   receive, from the base station, first control information, which is information on a frequency region to be subject to subband reporting and second control information, which is information on a maximum number of subbands to be subject to subband reporting,   receive, from the base station, information on a subband starting position for setting a subband group,   set an interval between subbands based on the first control information and the second control information,   set a subband group based on an interval between the starting position and the interval between the subbands, and   perform CSI reporting of the set subband group.   
     
     
         8 . The terminal of  claim 7 , wherein the processor is configured to receive, from the base station, information on a subband size to be used for the CSI reporting through a higher-layer signaling, and
 wherein the subband group is determined based on the subband size.   
     
     
         9 . The terminal of  claim 7 , wherein the second control information is determined based on the received CSI-reporting timing. 
     
     
         10 . The terminal of  claim 7 , wherein the interval is floor (first control information/second control information). 
     
     
         11 . The terminal of  claim 7 , wherein the processor is configured to
 transmit capability information of the terminal,   receive a reference value of SINR or CQI from a base station, and   measure the SINR or CQI of a subband, and   wherein in the setting of the subband group, the measured SINR or CQI and the reference value are compared with each other to set a subband in which the measured SINR or CQI is equal to or larger than the reference value as a subband group.   
     
     
         12 . The terminal of  claim 11 , wherein whether to set the subband group is determined based on the capability of the terminal and the received CSI timing.